Leather-skiving machine.



PATENTED APR. 16, 1907.

, D. DANIELS.

LEATHER SKIVING MACHINE.

APPLICATION TILED DEC. 6, 1906.

3 SHEETS-SHEET 1.

1 927268888. #Qlaww 11 WW THI mzRms PETERS m vusnmarou, b. c.

No. 850,627; PATENTED-A'PBJ6,1997-.

' I D.DANIELS." V

LEATHER SKIVING MACHINE.

APPLICATION FILED DEC. 6, 1906.

- a SH'BETSSHEET 2.

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THE NORRIS PETERS 517., WASHINGTON, n. c.

PATENTED APR. 16, 1907.

D. DANIELS. LEATHER SKIVING MACHINE.

3 SHEETS-S APPLICATION FILED DEC. s, 1906.

- JZM DAN DANIELS, OF DOVER,

NEW HAMPSHIRE.

LEATHER-"SKlVlNG MACHINE,

Specification of Letters Patent.

katenteci April 16, 1907.

Application filed December 6, 1906. Serial No, 346,529.

To all whom it may concern:

Be it known that I, DAN DANIELS, of Do ver, county of Strafford, State of New Hamp* shire, have invented an Improvement in Leather-Skiving Machines, of which the following description, in connection with the accompanying drawings, is a specification,

like characters on the drawings representing like parts.

This invention relates to that class of ma chines for skiving counters and tips for shoes in which the blank to be skived is pressed into a die or recess formed in one of a pair of feedrolls and while thus pressed into a concave shape, with its edges inclining to the horizontal, is fed against and split obliquely by a straight horizontal knife, which thus simultaneously performs the skiving operation upon the opposite edge portions of the blank.

Inasmuch as it is usually not desired to remove or split off any leather from the middle portion of. the blank, it is necessary to press such middle portion beyond the surface of the die-roll or the edges of the die. In prior devices of this character this function has been accomplished by means of a series of springactiiated fingers which lie in grooves in the lower feed-roll and are adapted to be moved beyond the surface thereof into the die-recess. This means is chiefly objectionable forthe reason that these fingers not only do not act to hold the blank from displace- 1r cut, but the spring tension thereon neces sary to cause them to press ordinarily stiff leather into the die-recess causes a strong frictional engagement between them and the blank, so that they not only render the employment of an excessive amount of power necessary to drive the machine, but the extent to which they drag on the blank'also often causes them to act to displace the blank in the die. Such displacement obviously causes the edges to i s unevenly skived.

T he principal object of my invention is to provide nteansjfor pressing and holding the blank in the die, where y friction on the blank will be practically eliminated, and practically the entire sfrface of the blank will also be pressed firmly against the bottom of the die and lie securely held from twisting or other movement in the die while it is being fed against the knife. I accomplish this object by the njieans shown in the aecomp anying drawings, .in whieh of Fig. 5.

F ignre l is an end elevation of a skivingmachine provided with my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a detail sectional view on the line a a of F ig. 1.. Fig. 4 is a detail sectional view on the line b b of Fig. 2. Fig. 5 is a sectional plan view on the line 0 c of Fig. 2. Figs. 6 and 7 are detail views similar to Figs. 3 and 4, respectively, showing different positions in the skiving operation. Figs. 8, 9, and 10 are respectively plan and sectional views of one of the blanks which the machine is adapted to operate upon. Fig. 11 is a sectional view on line (Z (Z Fig. 12'is a sectional view on line 6 e of Fig. 5.

' In the drawings, 1 indicates the frame or bed of the machine, in which a main shaft 2 is j ournaled, said shaft being adapted to be driven by a pulley 3 and bearing cams 4 and 5 and a gear 6. A shaft 7 is journaled in bearings 1, mounted rigidly upon the frame, and has mounted thereon the upper feedroll 8. A shaft 9 is j ournaled in bearings 10, which are slidable vertically in the frame and supported by means of springs 11, adjustable stops 100 being provided to limit the upward movement of said bearing. Said shafts 7 and 9 are provided with intermeshing gears and 90, the gear being driven from gear 6 by the intermediate idle gears 60 600. Said shaft 9 is provided with a longitudinally fluted or corrugated feedroll 12, having an annular recess 12 formed in the middle portion thereof, the ends of said recess being at right angles with the surface of the roll.

A magazine 13 is mounted on the bed of the machine and is adapted to receive a pile of blanks as, as indicated in Fig. 3, and a feeding-slide 14 is mounted in the frame and is adapted to be moved beneath the stack of blanks held. in the magazine, so as to engage the bottom blank and push it rearwardly to the feed-rolls 8 and 12 in proper time, as in other devices of this character.

The particular means for operating the slide 14, as shown, comprises a lever 15, which is pivoted at 16 and is adapted to be oscillated by the cam 5, which engages the lower end thereof, said lever being connected at its upper end by a link 17 to the slide and one rotation of the shaft 2 being adapted to cause the slide to make one complete reciprocation.

A knife-block 18 is mounted to slide parallel to the feed-rolls in ways formed in the bed of the machine, and a straight-edged splitting-knife 19 is adjustably supported on said. block by means of a pair of oppositely-disposed wedges 20 and 21. The lower wedge 21 is bolted to the block, and its inclined upper face is adapted to engage the correspondingly-inclined lower face of the upper wedge 20, tothe upper side of which the knife 19 is securely bolted. The wedge 21 is provided With a longitudinally-extending dovetail slot 21 in its inclined face, and :1. correspond- 1 ingly-shaped rib is provided on the inclined under side of wedge 20. A horizontal adjusting-screw 22 is threaded into said wedge 20 and has a swivel connection with the block 18, as shown, so that by turning said screw said wedge 20 may be moved longitudinally and the knife 19 be raised or lowered while its horizontal position is maintained.

A lever 25 is pivoted at 26 upon the frame and is adapted to be oscillated by the cam 4, said knife-block 18 being connected at one end to the upper end of said lever by means of a pivot 27 located in a slot (indicated in dotted lines, Fig. 1) formed in the lever. These parts are so arranged that one rotation of the main shaft will cause the knife 19 to make one complete reciprocation.

The upper roll 8 is provided with a removable die-plate 28, said plate being recessed to correspond to the shape of the blank which is to be pressed therein and being deepest in its middle portion and gradually decreasing in depth toward its edges at all points, as is customary in devices of this class. A pair of supporting-arms 29 extend divergently from i a single arm 29, which is pivoted at its opposite end to the frame by means of a pivot 30, and a presser-roll 31 is journaled to rotate freely at its end in the ends of said arms 29, said arms extending so as to hold the axis of said roll 31 approximately in the vertical lane in which the axes of the rolls 3 and 12 is, and said pivot 30 being located approximately in the horizontal plane in which the axis of roll 31 lies, when said roll is in its middle vertical position, so that the axis of said roll will lie approximately in the vertical plane of the axes of the feed-rolls in all of its vertical positions. The arms 29 lie close to the shoul ders formed at the ends of the recess 12 in the roll 12 and are made as thin as practicable. Said arms also extend transversely at their ends to an extent sufficient to support roll 31 out of contact with the bottom of recess 12. The middle recessed portion 12 of the roll 12 has secured thereto an eccentric 32, which is adapted to engage the under sides of said arms 29 adjacent the ends thereof .to raise said roll 31. Said roll 31 is made tapering from its middle portion toward each end correspondingly to the inclination of the bottom of the dieecess transversely thereof or longitudinally of the feed-rolls and is also fluted or corrugated longitudinally.

The slide 14 will be so timed that it will deliver one end of a blank to the die as its corresponding end approaches the vertical plane of the axes of the feedrolls, so that the blank may be pressed into its proper position in the die as it is carried between the rolls. At this time the splitting-knife 19 will be moving forwardly, so as to engage the blank with a drawing cut, the parts being so arranged that the knife moves forwardly during the entire time in which the blank is fed against it. At this point in the operation the cam or eccentric 32 engages the arms 29, so as to lift the presser-roll 31 into engagement with the blank and press the same firmly against the bottom of the die, and as the rolls advance the blank the eccentric lifts the arms 29 correspondingly to the increasing depth of the (11c, causing the roll 31 to be raised above the -8 5 surface of the roll 12, so that it may enter the die-recess and lorce the blank positively against the bottom thereof at points closely adjacent the edge of the knife throughout the entire movement between the roll. The eccentric permits roll 31 to be lowered correspondingly after the deepest point in the die has been reached. The parts are so arranged that one edge portion of the tip or counter which constitutes the blank will first be delivered between one end portion of the lower roll 12 and the upper roll or die, so that the tip will be forcibly fed thereby, and as the blank is immediately brought into contact with the idle resser-roll 31 the flutes therein will be pressed into the blank, causing a positive engagement therebetween. 'l he roll 31 will thus be caused to rotate as the blank is forced forward by the main rolls, and as said roll is adapted to rotate freely the engagement thereof with the blank will not appreciably impede the movement of the blank, so as to cause a drag thereon. However, the longitudinal flutes therein positively hold the blank from twisting movement with relation thereto. When the middle portion of the blank is being split, the opposite edge portion from that originally engaged will have run onto the opposite end of the roll 12, as indicated in Fig. .4, thus materially assisting in holding the blank from displacement. The blank is thus firmly held between the positively-driven upper and lower rolls and between the presser-roll and the bottom of the die-recess in the upper roll duringthe entire skiving operation, twisting or displacement thus being effectively prevented. After the blank has been passed between the rolls and skived, as shown in Figs. 9 and 10, the knife and feeding-slide 14 will be returned to their initial positions, as will be obvious.

In practice the shape of the presser-roll 31 and the eccentric 32 will be somewhat varied to correspond to the shape of the recess in the l opposite said recess,

particular die 28, which it is found necessary to employ for different blanks.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A skiving-machine, comprising a dieroll having a blank-receivingrecess and a presser-roll tapered at each end to fit into said recess longitudinally of the die-roll, and mounted to rotate adjacent thereto, means for causing said presser-roll to hold the blank against the bottom of said recess, and a knife disposed to split the blank as it is passed between said rolls, substantially as described.

2. A skiving-machine comprising a pair of feed-rolls, one of said rolls having a blank-receiving recess, and the other having an annular groove opposite said recess, a movable support, a presser-roll rotatably mounted in said support and disposed in said groove,

means for moving said support to cause said presser-roll to press the blank into said recess, means for driving said feed-rolls, and a knife disposed to split the blank as it is fed between said rolls, substantially as described. 7 3. A skir ing-machine comprising a feedrollhaving a blank-receiving recess therein, a support, a presser-roll mounted on said support to rotate about an axis parallel to said feed-roll, means for positively moving said support to force said roll into said recess to press the blank against the bottom thereof as it passes between said rolls, and a knife disposed to split the blank during said movement, substantially described.

l. A skiving-machine comprising a feedroll having a blank-receiving recess therein, a support, a presser-roll mounted on said support to rotate about an axis parallel to said feed-roll, a cam rotatably mounted adjacent said presser-roll for positively moving the same into said recess to press the blank against the bottom thereof as it passes between said rolls, and a knife disposed to split the blank during said movement, substantially as described.

5. A leatlierskiving machine comprising an upper and a lower feedroll, said upper roll having a blank-receiving recess and said lower roll having an annular groove therein opposite said recess, a vertically-movable arm independently supported adjacent said roll and extending into said groove adjacent said upper roll, a presser-rolbmounted to rotate freely in said arm, a cam on said lower roll for lifting said arm in time to cause its roll to press the blank into said recess, and a knife disposed to split the blank as it is fed between said rolls, substantially as described.

6. A leather skiving machine comprising an upper and a lower feed-roll, said upper roll having a blank-receiving recess and said lower roll having an annular groove therein a vertically-movable arm independently supported adjacent said roll and extending into said groove adjacent said upper roll, a presser-roll mounted to retate freely in said arm, cam on said lower roll for lifting said arm. in time to lift said presser-roll above the surface of said lower roll to press the blank against the bottom of said recess, and a knife disposed to split the blank as it is passed between said rolls, substantially as described.

7. A leather-skiving machine comprising an upper and lower feed-roll, said upper roll having a blank receiving recess and said lower roll having an annular groove therein opposite said recess, a air of verticallymovable arms supporter independently of saidrolls, and extending into said groove ad jacent said upper roll, a presser-roll rotatably mounted at its ends in said arms between said feed-rolls, a cam mounted on said lower roll for engaging said arms in time to raise said presser-roll to press the blank into said recess and a knife disposed to split the blank as it is fed between said rolls, substantially as described.

8. A leather-skiving machine comprising an upper and a lower feed-roll, said upper roll having a blank-receiving recess and said lower roll having an annular groove therein opposite said recess, a portion of the surface of the bottom of said groove adjacent each end being eccentric to the axis of the roll, a pair of vertically-movable arms extending into said groove adjacent the ends thereof and disposed to be engaged by the eccentric bottom portion thereof, a presser-roll rotatably mounted in said arms, said eccentric bottom portion being adapted and disposed to engage said armsto lift said presser-roll beyond the surface of said lower roll in time to press the blank into said recess, and a knife disposed to split the blank as it is passed between said rolls, substantially as described.

9. A leather-skiving machine,, comprising an upper and a lower feed-roll, said lower roll having an annular groove in the middle portion thereof and said upper roll having therein a blank-receiving recess disposed opposite said groove and an adjacent portion of said lower roll, a support, a presser-roll rotatably mounted thereon and disposed in said groove between said feed-rolls, means for moving said presser-roll vertically to press the blank into said recess, and a knife dis posed to split the blank as it is held between said upper roll, and said lower and presser roll, substantially as described.

10. A leather-skiving machine, comprising an upper and a lower feed-roll, said lower roll having an annular groove in the middle portion thereof and said upper roll having therein a lllttlilk-IGGGiVilig recess disposed op posite said groove and an adjacent portion of said lower roll at each end of said groove, a

In testimony whereof I have signed my name to this specification 1n the presence of IO two subscribing witnesses.

DAN DANIELS.

support, a presser-roll rotatably mounted thereon and disposed in said groove between said feed-rolls, means for moving said presserroll Vertically to press the blank into said recess, and a knife disposed to split the blank I as it is held between said upper roll, and said Witnesses: lower and presser roll, substantially as de- L. H. HARRIMAN, scribed. H. B. DAVIS. 

